What I find very interesting is that you used grey paper in combination with copic markers*. I never thought of that before, but the effect it creates is fantastic; quite plastic and 3D-looking. And of course, the highlights are all well-placed. On one of the tubes they're a bit very scribbly, but that's just a small thing ^^

'nother thing is the left (seen as right) foot; there's something slightly off about it but I can't say what exactly it is.

Overall, the mechanical look is cool. ^^ It even looks very much like the MoC while staying true to your style.